Data preparation
# Libraries
library(tidyverse)
library(raster)
library(tidyr)
library(ggplot2)
library(RColorBrewer)
library(broom)
library(ggthemes)
# Get each countries shapefile
countries <- c('Gabon', 'Mozambique', 'Tanzania')
iso3s <- c('GAB', 'MOZ', 'TZA')
for(i in 1:length(countries)){
message('Fetching data for ', countries[i])
x <- getData(name = 'GADM', level = 2, country = iso3s[i])
assign(tolower(countries[i]),
x,
envir = .GlobalEnv)
}
# Define which districts are "special" -------------
specials <- c('Ogooué et des Lacs','Douya Onoye',
'Bilene','Manhiça',
'Bagamoyo','Kisarawe')
# Gabon
gabon@data$special <- FALSE
gabon@data$special[gabon@data$NAME_2 %in% specials] <- TRUE
# Mozambique
mozambique@data$special <- FALSE
mozambique@data$special[mozambique@data$NAME_2 %in% specials] <- TRUE
# Tanzania
tanzania@data$special <- FALSE
tanzania@data$special[tanzania@data$NAME_2 %in% specials] <- TRUE
# Combine all data into a "long" / "tidy" format
make_long <- function(x, region = "NAME_2"){
shp_df <- broom::tidy(x, region = region)
return(shp_df)
}
gabon_long <- make_long(gabon) %>% mutate(country = 'Gabon')
mozambique_long <- make_long(mozambique) %>% mutate(country = 'Mozambique')
tanzania_long <- make_long(tanzania) %>% mutate(country = 'Tanzania')
combined <- bind_rows(
gabon_long,
mozambique_long,
tanzania_long
)
combined$special <- combined$id %in% specials
# combined$special[!combined$special] <- NA
# Get a map of africa to use as a background
# from the cism package!
africa <- cism::africa
africa_long <- make_long(africa, region = 'COUNTRY')
africa_long$special <- africa_long$id %in% countries
Plotting code
ggplot() +
geom_polygon(data = africa_long,
aes(x = long,
y = lat,
group = group),
fill = grey(0.6),
alpha = 1,
color = 'white',
lwd = 0.3) +
geom_polygon(data = combined,
aes(x = long,
y = lat,
group = group),
fill = grey(0.3)) +
geom_polygon(data = combined %>% filter(!is.na(special) & special),
aes(x = long,
y = lat,
group = group,
fill = special)) +
scale_fill_manual(name = '',
values = c('darkorange'),
na.value = NA) +
coord_cartesian() +
ggthemes::theme_map() +
theme(legend.position = 'none') +
# redraw country lines
geom_polygon(data = africa_long,
aes(x = long,
y = lat,
group = group),
fill = NA,
alpha = 1,
color = 'white',
lwd = 0.3)
country_map <- function(the_country = 'Gabon'){
ggplot(data = combined %>% filter(country == the_country),
aes(x = long,
y = lat,
group = group,
fill = special)) +
geom_polygon(alpha = 0.8,
lwd = 0.3,
color = 'white') +
theme_map() +
coord_cartesian() +
scale_fill_manual(name = '', values = c('darkgrey', 'darkred')) +
theme(legend.position = 'none')
}
country_map('Gabon')
country_map('Mozambique')
country_map('Tanzania')
library(leaflet)
library(leaflet.extras)
l <- leaflet() %>%
addTiles(group = "OSM (default)") %>%
addProviderTiles(providers$Esri.WorldImagery, group = 'Satelite') %>%
addProviderTiles(providers$Stamen.Toner, group = "Toner") %>%
addProviderTiles(providers$Stamen.TonerLite, group = "Toner Lite") %>%
addPolygons(data = gabon,
fillColor = ifelse(gabon$special, 'darkred', 'red'),
group = 'Gabon',
color = NA,
stroke = FALSE,
fillOpacity = ifelse(gabon$special, 0.9, 0.5)) %>%
addPolygons(data = mozambique,
fillColor = ifelse(mozambique$special, 'darkgreen', 'green'),
group = 'Mozambique',
color = NA,
stroke = FALSE,
fillOpacity = ifelse(mozambique$special, 0.9, 0.5)) %>%
addPolygons(data = tanzania,
fillColor = ifelse(tanzania$special, 'darkblue', 'lightblue'),
group = 'Tanzania',
color = NA,
stroke = FALSE,
fillOpacity = ifelse(tanzania$special, 0.9, 0.5)) %>%
# Layers control
addLayersControl(
baseGroups = c("OSM (default)", "Satelite", "Toner", "Toner Lite"),
overlayGroups = c("Gabon", "Mozambique", "Tanzania"),
options = layersControlOptions(collapsed = FALSE)
) %>%
leaflet.extras::addFullscreenControl(position = "topleft", pseudoFullscreen = FALSE)
l
